scholarly journals An efficient three-dimensional foil structure model for bump-type gas foil bearings considering friction

Friction ◽  
2020 ◽  
Author(s):  
Yongpeng Gu ◽  
Xudong Lan ◽  
Gexue Ren ◽  
Ming Zhou
Keyword(s):  
Structural Model ◽  
Three Dimensional ◽  
Element Model ◽  
Experimental Results ◽  
Synthesis Methods ◽  
Structure Model ◽  
Foil Bearings ◽  
Static Responses ◽  
Bearing Sleeve ◽  
Shell Finite Element

Abstract This paper presents an efficient three-dimensional (3D) structural model for bump-type gas foil bearings (GFBs) developed by considering friction. The foil structures are modeled with a 3D shell finite element model. Using the bump foil mechanical characteristics, the Guyan reduction and component mode synthesis methods are adopted to improve computational efficiency while guaranteeing accurate static responses. A contact model that includes friction and separation behaviors is presented to model the interactions of the bump foil with the top foil and bearing sleeve. The proposed structural model was validated with published analytical and experimental results. The coupled elastohydrodynamics model of GFBs was established by integration of the proposed structural model with data on hydrodynamic films, and it was validated by comparisons with existing experimental results. The performance of a bearing with an angular misalignment was studied numerically, revealing that the reaction torques of the misaligned bearing predicted by GFB models with 2D and 3D foil structure models are quite different. The 3D foil structure model should be used to study GFB misalignment.

Prediction Laser Sealed Advanced Ceramic Coatings Dimensions by Using Finite Element Model and Computational Method

2011 ◽  
Vol 264-265 ◽  
pp. 1444-1449
Author(s):  
K.M. Adel ◽  
E.K. Ekhlas ◽  
S.H. Shaker
Keyword(s):  
Heat Affected Zone ◽  
Three Dimensional ◽  
Element Model ◽  
Melting Zone ◽  
Ceramic Coatings ◽  
Experimental Results ◽  
Computational Method ◽  
Zone Model ◽  
Good Prediction ◽  
Good Agreement

A three dimensional FE modeling of the laser surface modification is presented. The design capabilities of the ANSYS (11) software were employed for this purpose. The model calculates the dimensions of melting zone and heat affected zone. Model simulations are compared with experimental results that showed very good agreement. A one dimensional model in V.B language was presented too. The model based on conduction of heat in one dimension neglecting the other losses of heat. The results of VISUAL BASIC were compared with experimental results which showed a very good agreement. The two methods were compared with each other to showing which method have a good prediction compared with experimental results in calculating of fusion zone and heat affected zone "HAZ".

Experimental Testing and Finite Element Modeling of Bump Wafer Probing

2013 ◽  
Vol 284-287 ◽  
pp. 748-753
Author(s):  
Hao Yuan Chang ◽  
Kao Hua Chang ◽  
Yi Shao Lai
Keyword(s):  
Finite Element ◽  
Solder Bump ◽  
Experimental Testing ◽  
Three Dimensional ◽  
Element Model ◽  
Simulation Software ◽  
Experimental Results ◽  
Height Variation ◽  
Bump Height ◽  
Wafer Probing

The purpose of this paper is mainly to develop a method to simulate the bump height variation and probe mark profile for Eutectic (Sn63/ Pb37) bump wafer probing with continuing-touchdown probing. Certainly, the bump height variation and probe mark area on the solder bump influence the quality of the wafer probing and further impacts reliability of the packaging process after wafer probing to cause issues of cold-joint and needle damage. A three-dimensional computational model of was developed to analyze the contact phenomena between the vertical needle and the solder bump. Finite element simulation software, ANSYS, is used to analyze the loading force distributed on the vertical needle with various overdrives. In addition, the results of the bump height variation and probe mark area, which predicted by the finite element method (FEM), were verified against the on-line experimental results. Finally, the results predicted by the finite element model is consistent with experimental results and the numerical method presented in the paper can be used as a useful evaluating method to support the choice of suitable probe geometry and wafer probe testing parameters.

Electromagnetic torque and strength analysis of combination rotor in high speed PMSM

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1019-1027
Author(s):  
Hao Lin ◽  
Haipeng Geng ◽  
Lie Yu ◽  
Hao Li ◽  
Sheng Feng ◽  
...  
Keyword(s):  
Finite Element ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Element Model ◽  
Strength Analysis ◽  
Electromagnetic Torque ◽  
Foil Bearings ◽  
Three Dimensional Finite Element

For a high-speed permanent magnet synchronous motor supported by air foil bearings, analyzing the influence of the electromagnetic torque on the strength of the combination rotor was necessary. In this study, the electromagnetic torque was obtained using the analytical calculation and the finite element simulation. The contact interface stress analytical equation affected by the electromagnetic torque was elaborated. A three-dimensional finite element model simulating the combination rotor was constructed, and the stress calculations were performed. The strength of the combination rotor met the design requirement. It properly reflected the characteristics of the electromechanical analysis in the combination rotor. The operation experiments were realized to verify the electromagnetic performance and the strength of the combination rotor. The simulation and experimental results were significant for the electromechanical design and analysis of the combination rotor.

Theoretical Performance of a Hydrostatic Foil Bearing

1994 ◽  
Vol 116 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Marc Carpino ◽  
Jih-Ping Peng
Keyword(s):  
Finite Element ◽  
Reynolds Equation ◽  
Structural Model ◽  
Three Dimensional ◽  
Element Model ◽  
Element Formulation ◽  
Foil Bearing ◽  
Dimensional Finite Element ◽  
Membrane Effects ◽  
Three Dimensional Finite Element

The performance of a hydrostatic foil journal bearing operating with an incompressible fluid is discussed. In the configuration considered here, pressurized lubricant fluid is supplied through capillaries to recessed pockets on the surface of the journal. The foil is treated as a perfectly flexible, inextensible shell by a three dimensional finite element model. The pressure distribution is predicted by a finite element formulation of the incompressible Reynolds equation. Results are presented which demonstrate that the foil structure enhances load support while increasing lubricant film thickness. In addition, results indicate that membrane effects are essential in the structural model.

Three-dimensional dynamic finite element and experimental models for drilling processes

2015 ◽  
Vol 232 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Maria G Fernandes ◽  
Elza M Fonseca ◽  
Renato M Natal
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Mechanical Damage ◽  
Element Model ◽  
Experimental Models ◽  
Experimental Results ◽  
Structural Deformation ◽  
Drilling Process ◽  
Rigid Foam ◽  
Dynamic Finite Element

The main goal of this paper is to assess the mechanical damage in solid rigid foam materials with similar mechanical properties to the human bone induced by the cutting parameters. In the present study, a three-dimensional dynamic finite element model was developed to simulate the drilling process in solid rigid foam materials and it was validated with experimental results. Using an explicit dynamic numerical simulation, it is possible to obtain large structural deformation with high load intensity in short time frame. The developed model is used to study the effects of different high intensity loads distribution in the solid rigid foam materials. Laboratory tests were produced using biomechanical test blocks instrumented with strain gauges in different surface positions during the drilling process. The comparison between the numerical and the experimental results enables the evaluation and improvements of the cutting process. It was concluded when the feed-rate is higher, the stresses and strains in the solid rigid foam material are lower. The developed numerical model proved to be a great tool in this kind of analysis and available to use in forthcoming tests.

Tall Building Structure’s Heightening Reform and Elasto-Plastic Analysis

2011 ◽  
Vol 94-96 ◽  
pp. 1322-1327
Author(s):  
Qin Wang ◽  
Pei Xia Chen ◽  
Xin Zhang ◽  
He Qi Tang ◽  
Yang Xu
Keyword(s):  
Three Dimensional ◽  
Fem Analysis ◽  
Element Model ◽  
Time Travel ◽  
Tall Building ◽  
Structure Model ◽  
Vibration Period ◽  
Acceleration Time ◽  
Plastic Analysis ◽  
Three Dimensional Finite Element

Aim at one tall building structure model, which is a nonlinear three-dimensional finite element model. ANSYS FEM software is used to set up the structure model, proceeding modal analysis on natural vibration period and vibration model; ANSYS FEM software is used to import El Centro and Taft acceleration time-travel curves, which are used in 7 degree film, proceeding elasto-plastic analysis, and compared with the result of PKPM software earthquake static effect, the layer displacement calculation results contrast between two software shows it is consistent, but contrary results occurs in ISDA. So for the similar project design auxiliary FEM analysis is needed; Seven degree rarely met earthquake acceleration time-travel data and larger seismic peak acceleration time-travel imported to research the plastic development.

Multiphase hydrodynamic lubrication flow using a three-dimensional shell finite element model

2013 ◽  
Vol 87 ◽  
pp. 12-25 ◽  
Author(s):  
Scott A. Roberts ◽  
David R. Noble ◽  
Eric M. Benner ◽  
P. Randall Schunk
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Hydrodynamic Lubrication ◽  
Three Dimensional ◽  
Element Model ◽  
Shell Finite Element

The Static Performance Analysis of Air Foil Journal Bearings Considering Three-Dimensional Structure of Bump Foil

2005 ◽  
Author(s):  
Dong-Hyun Lee ◽  
Young-Cheol Kim ◽  
Kyung-Woong Kim
Keyword(s):  
Finite Element ◽  
Load Capacity ◽  
Three Dimensional ◽  
Element Model ◽  
Journal Bearings ◽  
Dimensional Structure ◽  
Suggested Model ◽  
3 Dimensional ◽  
Foil Bearings ◽  
Static Performance

The calculation of bump foil deflection is very important to predict the performance of foil bearings more accurately, because the foil bearings consist of top foil and its elastic foundation usually called bump foil. For the purpose of this, a finite element model considering 3-dimensional structure of the bump foil is developed to calculate the deflection of inter-connected bump. The results obtained from the suggested model are compared and analyzed with those from the previous proposed deflection models. In addition, load capacity of the foil bearings is analyzed by using this model.

scholarly journals Vibration analysis of deep groove ball bearing with outer race defect using ABAQUS

2016 ◽  
Vol 35 (4) ◽  
pp. 312-325 ◽  
Author(s):  
A Nabhan ◽  
M Nouby ◽  
AM Sami ◽  
MO Mousa
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Angular Position ◽  
Three Dimensional ◽  
Element Model ◽  
Experimental Results ◽  
Local Defect ◽  
Outer Race ◽  
Deep Groove ◽  
Three Dimensional Finite Element

The main objective of this paper is to determine the effect of outer race defect of deep groove ball bearings for (SKF 6004) through experimental and numerical methods. Three-dimensional finite element model of the housing and outer race is simulated using commercial package ABAQUS/CAE. Angular position of the local defect on the outer race which changes from 0° to 315° with angular intervals 45° is investigated through the dynamic finite element model. Experimental results are obtained using bearing test rig to validate the simulated results. A good agreement is found between the results obtained by the finite element model and the experimental results.

Study on the Static Performance of Steel Truss Structure

2013 ◽  
Vol 438-439 ◽  
pp. 715-718
Author(s):  
Ming Hui Liu ◽  
Ai Guo Yin
Keyword(s):  
Structural Model ◽  
Element Model ◽  
Limited Area ◽  
Gusset Plates ◽  
Test Information ◽  
Distribution Rules ◽  
Static Responses ◽  
Local Stresses ◽  
Steel Truss ◽  
Static Performance

This paper aims to experimentally study static responses of bridge longitudinal truss, and the distribution rules of the structural and local stresses were analyzed. The results of the analyses on experimental data show that the typical details in the longitudinal truss concentrate to a limited area on the toe of a dominate weld at the intersection among the upper chord or bottom chord, diagonal and the gusset plates; with boundary conditions being strengthened, stress distribution of the tested specimen became flat and the monolithic tress level decreased relatively. Based on obtained test information, the results are used for updating and validating this kind of structural model, and determining the parameters of finite element model.

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